1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Abstract layer for MIDI v1.0 stream 4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 5 */ 6 7 #include <sound/core.h> 8 #include <linux/major.h> 9 #include <linux/init.h> 10 #include <linux/sched/signal.h> 11 #include <linux/slab.h> 12 #include <linux/time.h> 13 #include <linux/wait.h> 14 #include <linux/mutex.h> 15 #include <linux/module.h> 16 #include <linux/delay.h> 17 #include <linux/mm.h> 18 #include <linux/nospec.h> 19 #include <sound/rawmidi.h> 20 #include <sound/info.h> 21 #include <sound/control.h> 22 #include <sound/minors.h> 23 #include <sound/initval.h> 24 25 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 26 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA."); 27 MODULE_LICENSE("GPL"); 28 29 #ifdef CONFIG_SND_OSSEMUL 30 static int midi_map[SNDRV_CARDS]; 31 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1}; 32 module_param_array(midi_map, int, NULL, 0444); 33 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device."); 34 module_param_array(amidi_map, int, NULL, 0444); 35 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device."); 36 #endif /* CONFIG_SND_OSSEMUL */ 37 38 static int snd_rawmidi_free(struct snd_rawmidi *rmidi); 39 static int snd_rawmidi_dev_free(struct snd_device *device); 40 static int snd_rawmidi_dev_register(struct snd_device *device); 41 static int snd_rawmidi_dev_disconnect(struct snd_device *device); 42 43 static LIST_HEAD(snd_rawmidi_devices); 44 static DEFINE_MUTEX(register_mutex); 45 46 #define rmidi_err(rmidi, fmt, args...) \ 47 dev_err(&(rmidi)->dev, fmt, ##args) 48 #define rmidi_warn(rmidi, fmt, args...) \ 49 dev_warn(&(rmidi)->dev, fmt, ##args) 50 #define rmidi_dbg(rmidi, fmt, args...) \ 51 dev_dbg(&(rmidi)->dev, fmt, ##args) 52 53 struct snd_rawmidi_status32 { 54 s32 stream; 55 s32 tstamp_sec; /* Timestamp */ 56 s32 tstamp_nsec; 57 u32 avail; /* available bytes */ 58 u32 xruns; /* count of overruns since last status (in bytes) */ 59 unsigned char reserved[16]; /* reserved for future use */ 60 }; 61 62 #define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32) 63 64 struct snd_rawmidi_status64 { 65 int stream; 66 u8 rsvd[4]; /* alignment */ 67 s64 tstamp_sec; /* Timestamp */ 68 s64 tstamp_nsec; 69 size_t avail; /* available bytes */ 70 size_t xruns; /* count of overruns since last status (in bytes) */ 71 unsigned char reserved[16]; /* reserved for future use */ 72 }; 73 74 #define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64) 75 76 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) 77 { 78 struct snd_rawmidi *rawmidi; 79 80 list_for_each_entry(rawmidi, &snd_rawmidi_devices, list) 81 if (rawmidi->card == card && rawmidi->device == device) 82 return rawmidi; 83 return NULL; 84 } 85 86 static inline unsigned short snd_rawmidi_file_flags(struct file *file) 87 { 88 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { 89 case FMODE_WRITE: 90 return SNDRV_RAWMIDI_LFLG_OUTPUT; 91 case FMODE_READ: 92 return SNDRV_RAWMIDI_LFLG_INPUT; 93 default: 94 return SNDRV_RAWMIDI_LFLG_OPEN; 95 } 96 } 97 98 static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime) 99 { 100 return runtime->avail >= runtime->avail_min; 101 } 102 103 static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream) 104 { 105 unsigned long flags; 106 bool ready; 107 108 spin_lock_irqsave(&substream->lock, flags); 109 ready = __snd_rawmidi_ready(substream->runtime); 110 spin_unlock_irqrestore(&substream->lock, flags); 111 return ready; 112 } 113 114 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream, 115 size_t count) 116 { 117 struct snd_rawmidi_runtime *runtime = substream->runtime; 118 119 return runtime->avail >= runtime->avail_min && 120 (!substream->append || runtime->avail >= count); 121 } 122 123 static void snd_rawmidi_input_event_work(struct work_struct *work) 124 { 125 struct snd_rawmidi_runtime *runtime = 126 container_of(work, struct snd_rawmidi_runtime, event_work); 127 128 if (runtime->event) 129 runtime->event(runtime->substream); 130 } 131 132 /* buffer refcount management: call with substream->lock held */ 133 static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime) 134 { 135 runtime->buffer_ref++; 136 } 137 138 static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime) 139 { 140 runtime->buffer_ref--; 141 } 142 143 static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream) 144 { 145 int loop = HZ; 146 147 spin_lock_irq(&substream->lock); 148 while (substream->runtime->buffer_ref) { 149 spin_unlock_irq(&substream->lock); 150 if (!--loop) { 151 rmidi_err(substream->rmidi, "Buffer ref sync timeout\n"); 152 return; 153 } 154 schedule_timeout_uninterruptible(1); 155 spin_lock_irq(&substream->lock); 156 } 157 spin_unlock_irq(&substream->lock); 158 } 159 160 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream) 161 { 162 struct snd_rawmidi_runtime *runtime; 163 164 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 165 if (!runtime) 166 return -ENOMEM; 167 runtime->substream = substream; 168 init_waitqueue_head(&runtime->sleep); 169 INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work); 170 runtime->event = NULL; 171 runtime->buffer_size = PAGE_SIZE; 172 runtime->avail_min = 1; 173 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 174 runtime->avail = 0; 175 else 176 runtime->avail = runtime->buffer_size; 177 runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL); 178 if (!runtime->buffer) { 179 kfree(runtime); 180 return -ENOMEM; 181 } 182 runtime->appl_ptr = runtime->hw_ptr = 0; 183 substream->runtime = runtime; 184 return 0; 185 } 186 187 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream) 188 { 189 struct snd_rawmidi_runtime *runtime = substream->runtime; 190 191 kvfree(runtime->buffer); 192 kfree(runtime); 193 substream->runtime = NULL; 194 return 0; 195 } 196 197 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up) 198 { 199 if (!substream->opened) 200 return; 201 substream->ops->trigger(substream, up); 202 } 203 204 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up) 205 { 206 if (!substream->opened) 207 return; 208 substream->ops->trigger(substream, up); 209 if (!up) 210 cancel_work_sync(&substream->runtime->event_work); 211 } 212 213 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime, 214 bool is_input) 215 { 216 runtime->drain = 0; 217 runtime->appl_ptr = runtime->hw_ptr = 0; 218 runtime->avail = is_input ? 0 : runtime->buffer_size; 219 } 220 221 static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream, 222 bool is_input) 223 { 224 unsigned long flags; 225 226 spin_lock_irqsave(&substream->lock, flags); 227 if (substream->opened && substream->runtime) 228 __reset_runtime_ptrs(substream->runtime, is_input); 229 spin_unlock_irqrestore(&substream->lock, flags); 230 } 231 232 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) 233 { 234 snd_rawmidi_output_trigger(substream, 0); 235 reset_runtime_ptrs(substream, false); 236 return 0; 237 } 238 EXPORT_SYMBOL(snd_rawmidi_drop_output); 239 240 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) 241 { 242 int err = 0; 243 long timeout; 244 struct snd_rawmidi_runtime *runtime; 245 246 spin_lock_irq(&substream->lock); 247 runtime = substream->runtime; 248 if (!substream->opened || !runtime || !runtime->buffer) { 249 err = -EINVAL; 250 } else { 251 snd_rawmidi_buffer_ref(runtime); 252 runtime->drain = 1; 253 } 254 spin_unlock_irq(&substream->lock); 255 if (err < 0) 256 return err; 257 258 timeout = wait_event_interruptible_timeout(runtime->sleep, 259 (runtime->avail >= runtime->buffer_size), 260 10*HZ); 261 262 spin_lock_irq(&substream->lock); 263 if (signal_pending(current)) 264 err = -ERESTARTSYS; 265 if (runtime->avail < runtime->buffer_size && !timeout) { 266 rmidi_warn(substream->rmidi, 267 "rawmidi drain error (avail = %li, buffer_size = %li)\n", 268 (long)runtime->avail, (long)runtime->buffer_size); 269 err = -EIO; 270 } 271 runtime->drain = 0; 272 spin_unlock_irq(&substream->lock); 273 274 if (err != -ERESTARTSYS) { 275 /* we need wait a while to make sure that Tx FIFOs are empty */ 276 if (substream->ops->drain) 277 substream->ops->drain(substream); 278 else 279 msleep(50); 280 snd_rawmidi_drop_output(substream); 281 } 282 283 spin_lock_irq(&substream->lock); 284 snd_rawmidi_buffer_unref(runtime); 285 spin_unlock_irq(&substream->lock); 286 287 return err; 288 } 289 EXPORT_SYMBOL(snd_rawmidi_drain_output); 290 291 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream) 292 { 293 snd_rawmidi_input_trigger(substream, 0); 294 reset_runtime_ptrs(substream, true); 295 return 0; 296 } 297 EXPORT_SYMBOL(snd_rawmidi_drain_input); 298 299 /* look for an available substream for the given stream direction; 300 * if a specific subdevice is given, try to assign it 301 */ 302 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice, 303 int stream, int mode, 304 struct snd_rawmidi_substream **sub_ret) 305 { 306 struct snd_rawmidi_substream *substream; 307 struct snd_rawmidi_str *s = &rmidi->streams[stream]; 308 static const unsigned int info_flags[2] = { 309 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT, 310 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT, 311 }; 312 313 if (!(rmidi->info_flags & info_flags[stream])) 314 return -ENXIO; 315 if (subdevice >= 0 && subdevice >= s->substream_count) 316 return -ENODEV; 317 318 list_for_each_entry(substream, &s->substreams, list) { 319 if (substream->opened) { 320 if (stream == SNDRV_RAWMIDI_STREAM_INPUT || 321 !(mode & SNDRV_RAWMIDI_LFLG_APPEND) || 322 !substream->append) 323 continue; 324 } 325 if (subdevice < 0 || subdevice == substream->number) { 326 *sub_ret = substream; 327 return 0; 328 } 329 } 330 return -EAGAIN; 331 } 332 333 /* open and do ref-counting for the given substream */ 334 static int open_substream(struct snd_rawmidi *rmidi, 335 struct snd_rawmidi_substream *substream, 336 int mode) 337 { 338 int err; 339 340 if (substream->use_count == 0) { 341 err = snd_rawmidi_runtime_create(substream); 342 if (err < 0) 343 return err; 344 err = substream->ops->open(substream); 345 if (err < 0) { 346 snd_rawmidi_runtime_free(substream); 347 return err; 348 } 349 spin_lock_irq(&substream->lock); 350 substream->opened = 1; 351 substream->active_sensing = 0; 352 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) 353 substream->append = 1; 354 substream->pid = get_pid(task_pid(current)); 355 rmidi->streams[substream->stream].substream_opened++; 356 spin_unlock_irq(&substream->lock); 357 } 358 substream->use_count++; 359 return 0; 360 } 361 362 static void close_substream(struct snd_rawmidi *rmidi, 363 struct snd_rawmidi_substream *substream, 364 int cleanup); 365 366 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode, 367 struct snd_rawmidi_file *rfile) 368 { 369 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL; 370 int err; 371 372 rfile->input = rfile->output = NULL; 373 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) { 374 err = assign_substream(rmidi, subdevice, 375 SNDRV_RAWMIDI_STREAM_INPUT, 376 mode, &sinput); 377 if (err < 0) 378 return err; 379 } 380 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) { 381 err = assign_substream(rmidi, subdevice, 382 SNDRV_RAWMIDI_STREAM_OUTPUT, 383 mode, &soutput); 384 if (err < 0) 385 return err; 386 } 387 388 if (sinput) { 389 err = open_substream(rmidi, sinput, mode); 390 if (err < 0) 391 return err; 392 } 393 if (soutput) { 394 err = open_substream(rmidi, soutput, mode); 395 if (err < 0) { 396 if (sinput) 397 close_substream(rmidi, sinput, 0); 398 return err; 399 } 400 } 401 402 rfile->rmidi = rmidi; 403 rfile->input = sinput; 404 rfile->output = soutput; 405 return 0; 406 } 407 408 /* called from sound/core/seq/seq_midi.c */ 409 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 410 int mode, struct snd_rawmidi_file *rfile) 411 { 412 struct snd_rawmidi *rmidi; 413 int err = 0; 414 415 if (snd_BUG_ON(!rfile)) 416 return -EINVAL; 417 418 mutex_lock(®ister_mutex); 419 rmidi = snd_rawmidi_search(card, device); 420 if (!rmidi) 421 err = -ENODEV; 422 else if (!try_module_get(rmidi->card->module)) 423 err = -ENXIO; 424 mutex_unlock(®ister_mutex); 425 if (err < 0) 426 return err; 427 428 mutex_lock(&rmidi->open_mutex); 429 err = rawmidi_open_priv(rmidi, subdevice, mode, rfile); 430 mutex_unlock(&rmidi->open_mutex); 431 if (err < 0) 432 module_put(rmidi->card->module); 433 return err; 434 } 435 EXPORT_SYMBOL(snd_rawmidi_kernel_open); 436 437 static int snd_rawmidi_open(struct inode *inode, struct file *file) 438 { 439 int maj = imajor(inode); 440 struct snd_card *card; 441 int subdevice; 442 unsigned short fflags; 443 int err; 444 struct snd_rawmidi *rmidi; 445 struct snd_rawmidi_file *rawmidi_file = NULL; 446 wait_queue_entry_t wait; 447 448 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 449 return -EINVAL; /* invalid combination */ 450 451 err = stream_open(inode, file); 452 if (err < 0) 453 return err; 454 455 if (maj == snd_major) { 456 rmidi = snd_lookup_minor_data(iminor(inode), 457 SNDRV_DEVICE_TYPE_RAWMIDI); 458 #ifdef CONFIG_SND_OSSEMUL 459 } else if (maj == SOUND_MAJOR) { 460 rmidi = snd_lookup_oss_minor_data(iminor(inode), 461 SNDRV_OSS_DEVICE_TYPE_MIDI); 462 #endif 463 } else 464 return -ENXIO; 465 466 if (rmidi == NULL) 467 return -ENODEV; 468 469 if (!try_module_get(rmidi->card->module)) { 470 snd_card_unref(rmidi->card); 471 return -ENXIO; 472 } 473 474 mutex_lock(&rmidi->open_mutex); 475 card = rmidi->card; 476 err = snd_card_file_add(card, file); 477 if (err < 0) 478 goto __error_card; 479 fflags = snd_rawmidi_file_flags(file); 480 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */ 481 fflags |= SNDRV_RAWMIDI_LFLG_APPEND; 482 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL); 483 if (rawmidi_file == NULL) { 484 err = -ENOMEM; 485 goto __error; 486 } 487 rawmidi_file->user_pversion = 0; 488 init_waitqueue_entry(&wait, current); 489 add_wait_queue(&rmidi->open_wait, &wait); 490 while (1) { 491 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI); 492 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file); 493 if (err >= 0) 494 break; 495 if (err == -EAGAIN) { 496 if (file->f_flags & O_NONBLOCK) { 497 err = -EBUSY; 498 break; 499 } 500 } else 501 break; 502 set_current_state(TASK_INTERRUPTIBLE); 503 mutex_unlock(&rmidi->open_mutex); 504 schedule(); 505 mutex_lock(&rmidi->open_mutex); 506 if (rmidi->card->shutdown) { 507 err = -ENODEV; 508 break; 509 } 510 if (signal_pending(current)) { 511 err = -ERESTARTSYS; 512 break; 513 } 514 } 515 remove_wait_queue(&rmidi->open_wait, &wait); 516 if (err < 0) { 517 kfree(rawmidi_file); 518 goto __error; 519 } 520 #ifdef CONFIG_SND_OSSEMUL 521 if (rawmidi_file->input && rawmidi_file->input->runtime) 522 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR); 523 if (rawmidi_file->output && rawmidi_file->output->runtime) 524 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR); 525 #endif 526 file->private_data = rawmidi_file; 527 mutex_unlock(&rmidi->open_mutex); 528 snd_card_unref(rmidi->card); 529 return 0; 530 531 __error: 532 snd_card_file_remove(card, file); 533 __error_card: 534 mutex_unlock(&rmidi->open_mutex); 535 module_put(rmidi->card->module); 536 snd_card_unref(rmidi->card); 537 return err; 538 } 539 540 static void close_substream(struct snd_rawmidi *rmidi, 541 struct snd_rawmidi_substream *substream, 542 int cleanup) 543 { 544 if (--substream->use_count) 545 return; 546 547 if (cleanup) { 548 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT) 549 snd_rawmidi_input_trigger(substream, 0); 550 else { 551 if (substream->active_sensing) { 552 unsigned char buf = 0xfe; 553 /* sending single active sensing message 554 * to shut the device up 555 */ 556 snd_rawmidi_kernel_write(substream, &buf, 1); 557 } 558 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS) 559 snd_rawmidi_output_trigger(substream, 0); 560 } 561 snd_rawmidi_buffer_ref_sync(substream); 562 } 563 spin_lock_irq(&substream->lock); 564 substream->opened = 0; 565 substream->append = 0; 566 spin_unlock_irq(&substream->lock); 567 substream->ops->close(substream); 568 if (substream->runtime->private_free) 569 substream->runtime->private_free(substream); 570 snd_rawmidi_runtime_free(substream); 571 put_pid(substream->pid); 572 substream->pid = NULL; 573 rmidi->streams[substream->stream].substream_opened--; 574 } 575 576 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile) 577 { 578 struct snd_rawmidi *rmidi; 579 580 rmidi = rfile->rmidi; 581 mutex_lock(&rmidi->open_mutex); 582 if (rfile->input) { 583 close_substream(rmidi, rfile->input, 1); 584 rfile->input = NULL; 585 } 586 if (rfile->output) { 587 close_substream(rmidi, rfile->output, 1); 588 rfile->output = NULL; 589 } 590 rfile->rmidi = NULL; 591 mutex_unlock(&rmidi->open_mutex); 592 wake_up(&rmidi->open_wait); 593 } 594 595 /* called from sound/core/seq/seq_midi.c */ 596 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile) 597 { 598 struct snd_rawmidi *rmidi; 599 600 if (snd_BUG_ON(!rfile)) 601 return -ENXIO; 602 603 rmidi = rfile->rmidi; 604 rawmidi_release_priv(rfile); 605 module_put(rmidi->card->module); 606 return 0; 607 } 608 EXPORT_SYMBOL(snd_rawmidi_kernel_release); 609 610 static int snd_rawmidi_release(struct inode *inode, struct file *file) 611 { 612 struct snd_rawmidi_file *rfile; 613 struct snd_rawmidi *rmidi; 614 struct module *module; 615 616 rfile = file->private_data; 617 rmidi = rfile->rmidi; 618 rawmidi_release_priv(rfile); 619 kfree(rfile); 620 module = rmidi->card->module; 621 snd_card_file_remove(rmidi->card, file); 622 module_put(module); 623 return 0; 624 } 625 626 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream, 627 struct snd_rawmidi_info *info) 628 { 629 struct snd_rawmidi *rmidi; 630 631 if (substream == NULL) 632 return -ENODEV; 633 rmidi = substream->rmidi; 634 memset(info, 0, sizeof(*info)); 635 info->card = rmidi->card->number; 636 info->device = rmidi->device; 637 info->subdevice = substream->number; 638 info->stream = substream->stream; 639 info->flags = rmidi->info_flags; 640 strcpy(info->id, rmidi->id); 641 strcpy(info->name, rmidi->name); 642 strcpy(info->subname, substream->name); 643 info->subdevices_count = substream->pstr->substream_count; 644 info->subdevices_avail = (substream->pstr->substream_count - 645 substream->pstr->substream_opened); 646 return 0; 647 } 648 649 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream, 650 struct snd_rawmidi_info __user *_info) 651 { 652 struct snd_rawmidi_info info; 653 int err; 654 655 err = snd_rawmidi_info(substream, &info); 656 if (err < 0) 657 return err; 658 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 659 return -EFAULT; 660 return 0; 661 } 662 663 static int __snd_rawmidi_info_select(struct snd_card *card, 664 struct snd_rawmidi_info *info) 665 { 666 struct snd_rawmidi *rmidi; 667 struct snd_rawmidi_str *pstr; 668 struct snd_rawmidi_substream *substream; 669 670 rmidi = snd_rawmidi_search(card, info->device); 671 if (!rmidi) 672 return -ENXIO; 673 if (info->stream < 0 || info->stream > 1) 674 return -EINVAL; 675 info->stream = array_index_nospec(info->stream, 2); 676 pstr = &rmidi->streams[info->stream]; 677 if (pstr->substream_count == 0) 678 return -ENOENT; 679 if (info->subdevice >= pstr->substream_count) 680 return -ENXIO; 681 list_for_each_entry(substream, &pstr->substreams, list) { 682 if ((unsigned int)substream->number == info->subdevice) 683 return snd_rawmidi_info(substream, info); 684 } 685 return -ENXIO; 686 } 687 688 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info) 689 { 690 int ret; 691 692 mutex_lock(®ister_mutex); 693 ret = __snd_rawmidi_info_select(card, info); 694 mutex_unlock(®ister_mutex); 695 return ret; 696 } 697 EXPORT_SYMBOL(snd_rawmidi_info_select); 698 699 static int snd_rawmidi_info_select_user(struct snd_card *card, 700 struct snd_rawmidi_info __user *_info) 701 { 702 int err; 703 struct snd_rawmidi_info info; 704 705 if (get_user(info.device, &_info->device)) 706 return -EFAULT; 707 if (get_user(info.stream, &_info->stream)) 708 return -EFAULT; 709 if (get_user(info.subdevice, &_info->subdevice)) 710 return -EFAULT; 711 err = snd_rawmidi_info_select(card, &info); 712 if (err < 0) 713 return err; 714 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info))) 715 return -EFAULT; 716 return 0; 717 } 718 719 static int resize_runtime_buffer(struct snd_rawmidi_substream *substream, 720 struct snd_rawmidi_params *params, 721 bool is_input) 722 { 723 struct snd_rawmidi_runtime *runtime = substream->runtime; 724 char *newbuf, *oldbuf; 725 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; 726 727 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) 728 return -EINVAL; 729 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0) 730 return -EINVAL; 731 if (params->avail_min < 1 || params->avail_min > params->buffer_size) 732 return -EINVAL; 733 if (params->buffer_size != runtime->buffer_size) { 734 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL); 735 if (!newbuf) 736 return -ENOMEM; 737 spin_lock_irq(&substream->lock); 738 if (runtime->buffer_ref) { 739 spin_unlock_irq(&substream->lock); 740 kvfree(newbuf); 741 return -EBUSY; 742 } 743 oldbuf = runtime->buffer; 744 runtime->buffer = newbuf; 745 runtime->buffer_size = params->buffer_size; 746 __reset_runtime_ptrs(runtime, is_input); 747 spin_unlock_irq(&substream->lock); 748 kvfree(oldbuf); 749 } 750 runtime->avail_min = params->avail_min; 751 return 0; 752 } 753 754 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 755 struct snd_rawmidi_params *params) 756 { 757 int err; 758 759 snd_rawmidi_drain_output(substream); 760 mutex_lock(&substream->rmidi->open_mutex); 761 if (substream->append && substream->use_count > 1) 762 err = -EBUSY; 763 else 764 err = resize_runtime_buffer(substream, params, false); 765 766 if (!err) 767 substream->active_sensing = !params->no_active_sensing; 768 mutex_unlock(&substream->rmidi->open_mutex); 769 return err; 770 } 771 EXPORT_SYMBOL(snd_rawmidi_output_params); 772 773 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 774 struct snd_rawmidi_params *params) 775 { 776 unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; 777 unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK; 778 int err; 779 780 snd_rawmidi_drain_input(substream); 781 mutex_lock(&substream->rmidi->open_mutex); 782 if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE) 783 err = -EINVAL; 784 else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW) 785 err = -EINVAL; 786 else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) 787 err = -EINVAL; 788 else 789 err = resize_runtime_buffer(substream, params, true); 790 791 if (!err) { 792 substream->framing = framing; 793 substream->clock_type = clock_type; 794 } 795 mutex_unlock(&substream->rmidi->open_mutex); 796 return 0; 797 } 798 EXPORT_SYMBOL(snd_rawmidi_input_params); 799 800 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, 801 struct snd_rawmidi_status64 *status) 802 { 803 struct snd_rawmidi_runtime *runtime = substream->runtime; 804 805 memset(status, 0, sizeof(*status)); 806 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; 807 spin_lock_irq(&substream->lock); 808 status->avail = runtime->avail; 809 spin_unlock_irq(&substream->lock); 810 return 0; 811 } 812 813 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, 814 struct snd_rawmidi_status64 *status) 815 { 816 struct snd_rawmidi_runtime *runtime = substream->runtime; 817 818 memset(status, 0, sizeof(*status)); 819 status->stream = SNDRV_RAWMIDI_STREAM_INPUT; 820 spin_lock_irq(&substream->lock); 821 status->avail = runtime->avail; 822 status->xruns = runtime->xruns; 823 runtime->xruns = 0; 824 spin_unlock_irq(&substream->lock); 825 return 0; 826 } 827 828 static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile, 829 struct snd_rawmidi_status32 __user *argp) 830 { 831 int err = 0; 832 struct snd_rawmidi_status32 __user *status = argp; 833 struct snd_rawmidi_status32 status32; 834 struct snd_rawmidi_status64 status64; 835 836 if (copy_from_user(&status32, argp, 837 sizeof(struct snd_rawmidi_status32))) 838 return -EFAULT; 839 840 switch (status32.stream) { 841 case SNDRV_RAWMIDI_STREAM_OUTPUT: 842 if (rfile->output == NULL) 843 return -EINVAL; 844 err = snd_rawmidi_output_status(rfile->output, &status64); 845 break; 846 case SNDRV_RAWMIDI_STREAM_INPUT: 847 if (rfile->input == NULL) 848 return -EINVAL; 849 err = snd_rawmidi_input_status(rfile->input, &status64); 850 break; 851 default: 852 return -EINVAL; 853 } 854 if (err < 0) 855 return err; 856 857 status32 = (struct snd_rawmidi_status32) { 858 .stream = status64.stream, 859 .tstamp_sec = status64.tstamp_sec, 860 .tstamp_nsec = status64.tstamp_nsec, 861 .avail = status64.avail, 862 .xruns = status64.xruns, 863 }; 864 865 if (copy_to_user(status, &status32, sizeof(*status))) 866 return -EFAULT; 867 868 return 0; 869 } 870 871 static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile, 872 struct snd_rawmidi_status64 __user *argp) 873 { 874 int err = 0; 875 struct snd_rawmidi_status64 status; 876 877 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64))) 878 return -EFAULT; 879 880 switch (status.stream) { 881 case SNDRV_RAWMIDI_STREAM_OUTPUT: 882 if (rfile->output == NULL) 883 return -EINVAL; 884 err = snd_rawmidi_output_status(rfile->output, &status); 885 break; 886 case SNDRV_RAWMIDI_STREAM_INPUT: 887 if (rfile->input == NULL) 888 return -EINVAL; 889 err = snd_rawmidi_input_status(rfile->input, &status); 890 break; 891 default: 892 return -EINVAL; 893 } 894 if (err < 0) 895 return err; 896 if (copy_to_user(argp, &status, 897 sizeof(struct snd_rawmidi_status64))) 898 return -EFAULT; 899 return 0; 900 } 901 902 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 903 { 904 struct snd_rawmidi_file *rfile; 905 void __user *argp = (void __user *)arg; 906 907 rfile = file->private_data; 908 if (((cmd >> 8) & 0xff) != 'W') 909 return -ENOTTY; 910 switch (cmd) { 911 case SNDRV_RAWMIDI_IOCTL_PVERSION: 912 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0; 913 case SNDRV_RAWMIDI_IOCTL_INFO: 914 { 915 int stream; 916 struct snd_rawmidi_info __user *info = argp; 917 918 if (get_user(stream, &info->stream)) 919 return -EFAULT; 920 switch (stream) { 921 case SNDRV_RAWMIDI_STREAM_INPUT: 922 return snd_rawmidi_info_user(rfile->input, info); 923 case SNDRV_RAWMIDI_STREAM_OUTPUT: 924 return snd_rawmidi_info_user(rfile->output, info); 925 default: 926 return -EINVAL; 927 } 928 } 929 case SNDRV_RAWMIDI_IOCTL_USER_PVERSION: 930 if (get_user(rfile->user_pversion, (unsigned int __user *)arg)) 931 return -EFAULT; 932 return 0; 933 934 case SNDRV_RAWMIDI_IOCTL_PARAMS: 935 { 936 struct snd_rawmidi_params params; 937 938 if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) 939 return -EFAULT; 940 if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) { 941 params.mode = 0; 942 memset(params.reserved, 0, sizeof(params.reserved)); 943 } 944 switch (params.stream) { 945 case SNDRV_RAWMIDI_STREAM_OUTPUT: 946 if (rfile->output == NULL) 947 return -EINVAL; 948 return snd_rawmidi_output_params(rfile->output, ¶ms); 949 case SNDRV_RAWMIDI_STREAM_INPUT: 950 if (rfile->input == NULL) 951 return -EINVAL; 952 return snd_rawmidi_input_params(rfile->input, ¶ms); 953 default: 954 return -EINVAL; 955 } 956 } 957 case SNDRV_RAWMIDI_IOCTL_STATUS32: 958 return snd_rawmidi_ioctl_status32(rfile, argp); 959 case SNDRV_RAWMIDI_IOCTL_STATUS64: 960 return snd_rawmidi_ioctl_status64(rfile, argp); 961 case SNDRV_RAWMIDI_IOCTL_DROP: 962 { 963 int val; 964 965 if (get_user(val, (int __user *) argp)) 966 return -EFAULT; 967 switch (val) { 968 case SNDRV_RAWMIDI_STREAM_OUTPUT: 969 if (rfile->output == NULL) 970 return -EINVAL; 971 return snd_rawmidi_drop_output(rfile->output); 972 default: 973 return -EINVAL; 974 } 975 } 976 case SNDRV_RAWMIDI_IOCTL_DRAIN: 977 { 978 int val; 979 980 if (get_user(val, (int __user *) argp)) 981 return -EFAULT; 982 switch (val) { 983 case SNDRV_RAWMIDI_STREAM_OUTPUT: 984 if (rfile->output == NULL) 985 return -EINVAL; 986 return snd_rawmidi_drain_output(rfile->output); 987 case SNDRV_RAWMIDI_STREAM_INPUT: 988 if (rfile->input == NULL) 989 return -EINVAL; 990 return snd_rawmidi_drain_input(rfile->input); 991 default: 992 return -EINVAL; 993 } 994 } 995 default: 996 rmidi_dbg(rfile->rmidi, 997 "rawmidi: unknown command = 0x%x\n", cmd); 998 } 999 return -ENOTTY; 1000 } 1001 1002 static int snd_rawmidi_control_ioctl(struct snd_card *card, 1003 struct snd_ctl_file *control, 1004 unsigned int cmd, 1005 unsigned long arg) 1006 { 1007 void __user *argp = (void __user *)arg; 1008 1009 switch (cmd) { 1010 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE: 1011 { 1012 int device; 1013 1014 if (get_user(device, (int __user *)argp)) 1015 return -EFAULT; 1016 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ 1017 device = SNDRV_RAWMIDI_DEVICES - 1; 1018 mutex_lock(®ister_mutex); 1019 device = device < 0 ? 0 : device + 1; 1020 while (device < SNDRV_RAWMIDI_DEVICES) { 1021 if (snd_rawmidi_search(card, device)) 1022 break; 1023 device++; 1024 } 1025 if (device == SNDRV_RAWMIDI_DEVICES) 1026 device = -1; 1027 mutex_unlock(®ister_mutex); 1028 if (put_user(device, (int __user *)argp)) 1029 return -EFAULT; 1030 return 0; 1031 } 1032 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE: 1033 { 1034 int val; 1035 1036 if (get_user(val, (int __user *)argp)) 1037 return -EFAULT; 1038 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val; 1039 return 0; 1040 } 1041 case SNDRV_CTL_IOCTL_RAWMIDI_INFO: 1042 return snd_rawmidi_info_select_user(card, argp); 1043 } 1044 return -ENOIOCTLCMD; 1045 } 1046 1047 static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream, 1048 const unsigned char *buffer, int src_count, const struct timespec64 *tstamp) 1049 { 1050 struct snd_rawmidi_runtime *runtime = substream->runtime; 1051 struct snd_rawmidi_framing_tstamp *dest_ptr; 1052 struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec }; 1053 int orig_count = src_count; 1054 int frame_size = sizeof(struct snd_rawmidi_framing_tstamp); 1055 1056 BUILD_BUG_ON(frame_size != 0x20); 1057 if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0)) 1058 return -EINVAL; 1059 1060 while (src_count > 0) { 1061 if ((int)(runtime->buffer_size - runtime->avail) < frame_size) { 1062 runtime->xruns += src_count; 1063 break; 1064 } 1065 if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH) 1066 frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH; 1067 else { 1068 frame.length = src_count; 1069 memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH); 1070 } 1071 memcpy(frame.data, buffer, frame.length); 1072 buffer += frame.length; 1073 src_count -= frame.length; 1074 dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr); 1075 *dest_ptr = frame; 1076 runtime->avail += frame_size; 1077 runtime->hw_ptr += frame_size; 1078 runtime->hw_ptr %= runtime->buffer_size; 1079 } 1080 return orig_count - src_count; 1081 } 1082 1083 static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream) 1084 { 1085 struct timespec64 ts64 = {0, 0}; 1086 1087 switch (substream->clock_type) { 1088 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW: 1089 ktime_get_raw_ts64(&ts64); 1090 break; 1091 case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC: 1092 ktime_get_ts64(&ts64); 1093 break; 1094 case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME: 1095 ktime_get_real_ts64(&ts64); 1096 break; 1097 } 1098 return ts64; 1099 } 1100 1101 /** 1102 * snd_rawmidi_receive - receive the input data from the device 1103 * @substream: the rawmidi substream 1104 * @buffer: the buffer pointer 1105 * @count: the data size to read 1106 * 1107 * Reads the data from the internal buffer. 1108 * 1109 * Return: The size of read data, or a negative error code on failure. 1110 */ 1111 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 1112 const unsigned char *buffer, int count) 1113 { 1114 unsigned long flags; 1115 struct timespec64 ts64 = get_framing_tstamp(substream); 1116 int result = 0, count1; 1117 struct snd_rawmidi_runtime *runtime; 1118 1119 spin_lock_irqsave(&substream->lock, flags); 1120 if (!substream->opened) { 1121 result = -EBADFD; 1122 goto unlock; 1123 } 1124 runtime = substream->runtime; 1125 if (!runtime || !runtime->buffer) { 1126 rmidi_dbg(substream->rmidi, 1127 "snd_rawmidi_receive: input is not active!!!\n"); 1128 result = -EINVAL; 1129 goto unlock; 1130 } 1131 1132 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { 1133 result = receive_with_tstamp_framing(substream, buffer, count, &ts64); 1134 } else if (count == 1) { /* special case, faster code */ 1135 substream->bytes++; 1136 if (runtime->avail < runtime->buffer_size) { 1137 runtime->buffer[runtime->hw_ptr++] = buffer[0]; 1138 runtime->hw_ptr %= runtime->buffer_size; 1139 runtime->avail++; 1140 result++; 1141 } else { 1142 runtime->xruns++; 1143 } 1144 } else { 1145 substream->bytes += count; 1146 count1 = runtime->buffer_size - runtime->hw_ptr; 1147 if (count1 > count) 1148 count1 = count; 1149 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1150 count1 = runtime->buffer_size - runtime->avail; 1151 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1); 1152 runtime->hw_ptr += count1; 1153 runtime->hw_ptr %= runtime->buffer_size; 1154 runtime->avail += count1; 1155 count -= count1; 1156 result += count1; 1157 if (count > 0) { 1158 buffer += count1; 1159 count1 = count; 1160 if (count1 > (int)(runtime->buffer_size - runtime->avail)) { 1161 count1 = runtime->buffer_size - runtime->avail; 1162 runtime->xruns += count - count1; 1163 } 1164 if (count1 > 0) { 1165 memcpy(runtime->buffer, buffer, count1); 1166 runtime->hw_ptr = count1; 1167 runtime->avail += count1; 1168 result += count1; 1169 } 1170 } 1171 } 1172 if (result > 0) { 1173 if (runtime->event) 1174 schedule_work(&runtime->event_work); 1175 else if (__snd_rawmidi_ready(runtime)) 1176 wake_up(&runtime->sleep); 1177 } 1178 unlock: 1179 spin_unlock_irqrestore(&substream->lock, flags); 1180 return result; 1181 } 1182 EXPORT_SYMBOL(snd_rawmidi_receive); 1183 1184 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream, 1185 unsigned char __user *userbuf, 1186 unsigned char *kernelbuf, long count) 1187 { 1188 unsigned long flags; 1189 long result = 0, count1; 1190 struct snd_rawmidi_runtime *runtime = substream->runtime; 1191 unsigned long appl_ptr; 1192 int err = 0; 1193 1194 spin_lock_irqsave(&substream->lock, flags); 1195 snd_rawmidi_buffer_ref(runtime); 1196 while (count > 0 && runtime->avail) { 1197 count1 = runtime->buffer_size - runtime->appl_ptr; 1198 if (count1 > count) 1199 count1 = count; 1200 if (count1 > (int)runtime->avail) 1201 count1 = runtime->avail; 1202 1203 /* update runtime->appl_ptr before unlocking for userbuf */ 1204 appl_ptr = runtime->appl_ptr; 1205 runtime->appl_ptr += count1; 1206 runtime->appl_ptr %= runtime->buffer_size; 1207 runtime->avail -= count1; 1208 1209 if (kernelbuf) 1210 memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1); 1211 if (userbuf) { 1212 spin_unlock_irqrestore(&substream->lock, flags); 1213 if (copy_to_user(userbuf + result, 1214 runtime->buffer + appl_ptr, count1)) 1215 err = -EFAULT; 1216 spin_lock_irqsave(&substream->lock, flags); 1217 if (err) 1218 goto out; 1219 } 1220 result += count1; 1221 count -= count1; 1222 } 1223 out: 1224 snd_rawmidi_buffer_unref(runtime); 1225 spin_unlock_irqrestore(&substream->lock, flags); 1226 return result > 0 ? result : err; 1227 } 1228 1229 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 1230 unsigned char *buf, long count) 1231 { 1232 snd_rawmidi_input_trigger(substream, 1); 1233 return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count); 1234 } 1235 EXPORT_SYMBOL(snd_rawmidi_kernel_read); 1236 1237 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count, 1238 loff_t *offset) 1239 { 1240 long result; 1241 int count1; 1242 struct snd_rawmidi_file *rfile; 1243 struct snd_rawmidi_substream *substream; 1244 struct snd_rawmidi_runtime *runtime; 1245 1246 rfile = file->private_data; 1247 substream = rfile->input; 1248 if (substream == NULL) 1249 return -EIO; 1250 runtime = substream->runtime; 1251 snd_rawmidi_input_trigger(substream, 1); 1252 result = 0; 1253 while (count > 0) { 1254 spin_lock_irq(&substream->lock); 1255 while (!__snd_rawmidi_ready(runtime)) { 1256 wait_queue_entry_t wait; 1257 1258 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1259 spin_unlock_irq(&substream->lock); 1260 return result > 0 ? result : -EAGAIN; 1261 } 1262 init_waitqueue_entry(&wait, current); 1263 add_wait_queue(&runtime->sleep, &wait); 1264 set_current_state(TASK_INTERRUPTIBLE); 1265 spin_unlock_irq(&substream->lock); 1266 schedule(); 1267 remove_wait_queue(&runtime->sleep, &wait); 1268 if (rfile->rmidi->card->shutdown) 1269 return -ENODEV; 1270 if (signal_pending(current)) 1271 return result > 0 ? result : -ERESTARTSYS; 1272 spin_lock_irq(&substream->lock); 1273 if (!runtime->avail) { 1274 spin_unlock_irq(&substream->lock); 1275 return result > 0 ? result : -EIO; 1276 } 1277 } 1278 spin_unlock_irq(&substream->lock); 1279 count1 = snd_rawmidi_kernel_read1(substream, 1280 (unsigned char __user *)buf, 1281 NULL/*kernelbuf*/, 1282 count); 1283 if (count1 < 0) 1284 return result > 0 ? result : count1; 1285 result += count1; 1286 buf += count1; 1287 count -= count1; 1288 } 1289 return result; 1290 } 1291 1292 /** 1293 * snd_rawmidi_transmit_empty - check whether the output buffer is empty 1294 * @substream: the rawmidi substream 1295 * 1296 * Return: 1 if the internal output buffer is empty, 0 if not. 1297 */ 1298 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) 1299 { 1300 struct snd_rawmidi_runtime *runtime; 1301 int result; 1302 unsigned long flags; 1303 1304 spin_lock_irqsave(&substream->lock, flags); 1305 runtime = substream->runtime; 1306 if (!substream->opened || !runtime || !runtime->buffer) { 1307 rmidi_dbg(substream->rmidi, 1308 "snd_rawmidi_transmit_empty: output is not active!!!\n"); 1309 result = 1; 1310 } else { 1311 result = runtime->avail >= runtime->buffer_size; 1312 } 1313 spin_unlock_irqrestore(&substream->lock, flags); 1314 return result; 1315 } 1316 EXPORT_SYMBOL(snd_rawmidi_transmit_empty); 1317 1318 /* 1319 * __snd_rawmidi_transmit_peek - copy data from the internal buffer 1320 * @substream: the rawmidi substream 1321 * @buffer: the buffer pointer 1322 * @count: data size to transfer 1323 * 1324 * This is a variant of snd_rawmidi_transmit_peek() without spinlock. 1325 */ 1326 static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1327 unsigned char *buffer, int count) 1328 { 1329 int result, count1; 1330 struct snd_rawmidi_runtime *runtime = substream->runtime; 1331 1332 if (runtime->buffer == NULL) { 1333 rmidi_dbg(substream->rmidi, 1334 "snd_rawmidi_transmit_peek: output is not active!!!\n"); 1335 return -EINVAL; 1336 } 1337 result = 0; 1338 if (runtime->avail >= runtime->buffer_size) { 1339 /* warning: lowlevel layer MUST trigger down the hardware */ 1340 goto __skip; 1341 } 1342 if (count == 1) { /* special case, faster code */ 1343 *buffer = runtime->buffer[runtime->hw_ptr]; 1344 result++; 1345 } else { 1346 count1 = runtime->buffer_size - runtime->hw_ptr; 1347 if (count1 > count) 1348 count1 = count; 1349 if (count1 > (int)(runtime->buffer_size - runtime->avail)) 1350 count1 = runtime->buffer_size - runtime->avail; 1351 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); 1352 count -= count1; 1353 result += count1; 1354 if (count > 0) { 1355 if (count > (int)(runtime->buffer_size - runtime->avail - count1)) 1356 count = runtime->buffer_size - runtime->avail - count1; 1357 memcpy(buffer + count1, runtime->buffer, count); 1358 result += count; 1359 } 1360 } 1361 __skip: 1362 return result; 1363 } 1364 1365 /** 1366 * snd_rawmidi_transmit_peek - copy data from the internal buffer 1367 * @substream: the rawmidi substream 1368 * @buffer: the buffer pointer 1369 * @count: data size to transfer 1370 * 1371 * Copies data from the internal output buffer to the given buffer. 1372 * 1373 * Call this in the interrupt handler when the midi output is ready, 1374 * and call snd_rawmidi_transmit_ack() after the transmission is 1375 * finished. 1376 * 1377 * Return: The size of copied data, or a negative error code on failure. 1378 */ 1379 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 1380 unsigned char *buffer, int count) 1381 { 1382 int result; 1383 unsigned long flags; 1384 1385 spin_lock_irqsave(&substream->lock, flags); 1386 if (!substream->opened || !substream->runtime) 1387 result = -EBADFD; 1388 else 1389 result = __snd_rawmidi_transmit_peek(substream, buffer, count); 1390 spin_unlock_irqrestore(&substream->lock, flags); 1391 return result; 1392 } 1393 EXPORT_SYMBOL(snd_rawmidi_transmit_peek); 1394 1395 /* 1396 * __snd_rawmidi_transmit_ack - acknowledge the transmission 1397 * @substream: the rawmidi substream 1398 * @count: the transferred count 1399 * 1400 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock. 1401 */ 1402 static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, 1403 int count) 1404 { 1405 struct snd_rawmidi_runtime *runtime = substream->runtime; 1406 1407 if (runtime->buffer == NULL) { 1408 rmidi_dbg(substream->rmidi, 1409 "snd_rawmidi_transmit_ack: output is not active!!!\n"); 1410 return -EINVAL; 1411 } 1412 snd_BUG_ON(runtime->avail + count > runtime->buffer_size); 1413 runtime->hw_ptr += count; 1414 runtime->hw_ptr %= runtime->buffer_size; 1415 runtime->avail += count; 1416 substream->bytes += count; 1417 if (count > 0) { 1418 if (runtime->drain || __snd_rawmidi_ready(runtime)) 1419 wake_up(&runtime->sleep); 1420 } 1421 return count; 1422 } 1423 1424 /** 1425 * snd_rawmidi_transmit_ack - acknowledge the transmission 1426 * @substream: the rawmidi substream 1427 * @count: the transferred count 1428 * 1429 * Advances the hardware pointer for the internal output buffer with 1430 * the given size and updates the condition. 1431 * Call after the transmission is finished. 1432 * 1433 * Return: The advanced size if successful, or a negative error code on failure. 1434 */ 1435 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) 1436 { 1437 int result; 1438 unsigned long flags; 1439 1440 spin_lock_irqsave(&substream->lock, flags); 1441 if (!substream->opened || !substream->runtime) 1442 result = -EBADFD; 1443 else 1444 result = __snd_rawmidi_transmit_ack(substream, count); 1445 spin_unlock_irqrestore(&substream->lock, flags); 1446 return result; 1447 } 1448 EXPORT_SYMBOL(snd_rawmidi_transmit_ack); 1449 1450 /** 1451 * snd_rawmidi_transmit - copy from the buffer to the device 1452 * @substream: the rawmidi substream 1453 * @buffer: the buffer pointer 1454 * @count: the data size to transfer 1455 * 1456 * Copies data from the buffer to the device and advances the pointer. 1457 * 1458 * Return: The copied size if successful, or a negative error code on failure. 1459 */ 1460 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 1461 unsigned char *buffer, int count) 1462 { 1463 int result; 1464 unsigned long flags; 1465 1466 spin_lock_irqsave(&substream->lock, flags); 1467 if (!substream->opened) 1468 result = -EBADFD; 1469 else { 1470 count = __snd_rawmidi_transmit_peek(substream, buffer, count); 1471 if (count <= 0) 1472 result = count; 1473 else 1474 result = __snd_rawmidi_transmit_ack(substream, count); 1475 } 1476 spin_unlock_irqrestore(&substream->lock, flags); 1477 return result; 1478 } 1479 EXPORT_SYMBOL(snd_rawmidi_transmit); 1480 1481 /** 1482 * snd_rawmidi_proceed - Discard the all pending bytes and proceed 1483 * @substream: rawmidi substream 1484 * 1485 * Return: the number of discarded bytes 1486 */ 1487 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream) 1488 { 1489 struct snd_rawmidi_runtime *runtime; 1490 unsigned long flags; 1491 int count = 0; 1492 1493 spin_lock_irqsave(&substream->lock, flags); 1494 runtime = substream->runtime; 1495 if (substream->opened && runtime && 1496 runtime->avail < runtime->buffer_size) { 1497 count = runtime->buffer_size - runtime->avail; 1498 __snd_rawmidi_transmit_ack(substream, count); 1499 } 1500 spin_unlock_irqrestore(&substream->lock, flags); 1501 return count; 1502 } 1503 EXPORT_SYMBOL(snd_rawmidi_proceed); 1504 1505 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, 1506 const unsigned char __user *userbuf, 1507 const unsigned char *kernelbuf, 1508 long count) 1509 { 1510 unsigned long flags; 1511 long count1, result; 1512 struct snd_rawmidi_runtime *runtime = substream->runtime; 1513 unsigned long appl_ptr; 1514 1515 if (!kernelbuf && !userbuf) 1516 return -EINVAL; 1517 if (snd_BUG_ON(!runtime->buffer)) 1518 return -EINVAL; 1519 1520 result = 0; 1521 spin_lock_irqsave(&substream->lock, flags); 1522 if (substream->append) { 1523 if ((long)runtime->avail < count) { 1524 spin_unlock_irqrestore(&substream->lock, flags); 1525 return -EAGAIN; 1526 } 1527 } 1528 snd_rawmidi_buffer_ref(runtime); 1529 while (count > 0 && runtime->avail > 0) { 1530 count1 = runtime->buffer_size - runtime->appl_ptr; 1531 if (count1 > count) 1532 count1 = count; 1533 if (count1 > (long)runtime->avail) 1534 count1 = runtime->avail; 1535 1536 /* update runtime->appl_ptr before unlocking for userbuf */ 1537 appl_ptr = runtime->appl_ptr; 1538 runtime->appl_ptr += count1; 1539 runtime->appl_ptr %= runtime->buffer_size; 1540 runtime->avail -= count1; 1541 1542 if (kernelbuf) 1543 memcpy(runtime->buffer + appl_ptr, 1544 kernelbuf + result, count1); 1545 else if (userbuf) { 1546 spin_unlock_irqrestore(&substream->lock, flags); 1547 if (copy_from_user(runtime->buffer + appl_ptr, 1548 userbuf + result, count1)) { 1549 spin_lock_irqsave(&substream->lock, flags); 1550 result = result > 0 ? result : -EFAULT; 1551 goto __end; 1552 } 1553 spin_lock_irqsave(&substream->lock, flags); 1554 } 1555 result += count1; 1556 count -= count1; 1557 } 1558 __end: 1559 count1 = runtime->avail < runtime->buffer_size; 1560 snd_rawmidi_buffer_unref(runtime); 1561 spin_unlock_irqrestore(&substream->lock, flags); 1562 if (count1) 1563 snd_rawmidi_output_trigger(substream, 1); 1564 return result; 1565 } 1566 1567 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 1568 const unsigned char *buf, long count) 1569 { 1570 return snd_rawmidi_kernel_write1(substream, NULL, buf, count); 1571 } 1572 EXPORT_SYMBOL(snd_rawmidi_kernel_write); 1573 1574 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, 1575 size_t count, loff_t *offset) 1576 { 1577 long result, timeout; 1578 int count1; 1579 struct snd_rawmidi_file *rfile; 1580 struct snd_rawmidi_runtime *runtime; 1581 struct snd_rawmidi_substream *substream; 1582 1583 rfile = file->private_data; 1584 substream = rfile->output; 1585 runtime = substream->runtime; 1586 /* we cannot put an atomic message to our buffer */ 1587 if (substream->append && count > runtime->buffer_size) 1588 return -EIO; 1589 result = 0; 1590 while (count > 0) { 1591 spin_lock_irq(&substream->lock); 1592 while (!snd_rawmidi_ready_append(substream, count)) { 1593 wait_queue_entry_t wait; 1594 1595 if (file->f_flags & O_NONBLOCK) { 1596 spin_unlock_irq(&substream->lock); 1597 return result > 0 ? result : -EAGAIN; 1598 } 1599 init_waitqueue_entry(&wait, current); 1600 add_wait_queue(&runtime->sleep, &wait); 1601 set_current_state(TASK_INTERRUPTIBLE); 1602 spin_unlock_irq(&substream->lock); 1603 timeout = schedule_timeout(30 * HZ); 1604 remove_wait_queue(&runtime->sleep, &wait); 1605 if (rfile->rmidi->card->shutdown) 1606 return -ENODEV; 1607 if (signal_pending(current)) 1608 return result > 0 ? result : -ERESTARTSYS; 1609 spin_lock_irq(&substream->lock); 1610 if (!runtime->avail && !timeout) { 1611 spin_unlock_irq(&substream->lock); 1612 return result > 0 ? result : -EIO; 1613 } 1614 } 1615 spin_unlock_irq(&substream->lock); 1616 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); 1617 if (count1 < 0) 1618 return result > 0 ? result : count1; 1619 result += count1; 1620 buf += count1; 1621 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) 1622 break; 1623 count -= count1; 1624 } 1625 if (file->f_flags & O_DSYNC) { 1626 spin_lock_irq(&substream->lock); 1627 while (runtime->avail != runtime->buffer_size) { 1628 wait_queue_entry_t wait; 1629 unsigned int last_avail = runtime->avail; 1630 1631 init_waitqueue_entry(&wait, current); 1632 add_wait_queue(&runtime->sleep, &wait); 1633 set_current_state(TASK_INTERRUPTIBLE); 1634 spin_unlock_irq(&substream->lock); 1635 timeout = schedule_timeout(30 * HZ); 1636 remove_wait_queue(&runtime->sleep, &wait); 1637 if (signal_pending(current)) 1638 return result > 0 ? result : -ERESTARTSYS; 1639 if (runtime->avail == last_avail && !timeout) 1640 return result > 0 ? result : -EIO; 1641 spin_lock_irq(&substream->lock); 1642 } 1643 spin_unlock_irq(&substream->lock); 1644 } 1645 return result; 1646 } 1647 1648 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait) 1649 { 1650 struct snd_rawmidi_file *rfile; 1651 struct snd_rawmidi_runtime *runtime; 1652 __poll_t mask; 1653 1654 rfile = file->private_data; 1655 if (rfile->input != NULL) { 1656 runtime = rfile->input->runtime; 1657 snd_rawmidi_input_trigger(rfile->input, 1); 1658 poll_wait(file, &runtime->sleep, wait); 1659 } 1660 if (rfile->output != NULL) { 1661 runtime = rfile->output->runtime; 1662 poll_wait(file, &runtime->sleep, wait); 1663 } 1664 mask = 0; 1665 if (rfile->input != NULL) { 1666 if (snd_rawmidi_ready(rfile->input)) 1667 mask |= EPOLLIN | EPOLLRDNORM; 1668 } 1669 if (rfile->output != NULL) { 1670 if (snd_rawmidi_ready(rfile->output)) 1671 mask |= EPOLLOUT | EPOLLWRNORM; 1672 } 1673 return mask; 1674 } 1675 1676 /* 1677 */ 1678 #ifdef CONFIG_COMPAT 1679 #include "rawmidi_compat.c" 1680 #else 1681 #define snd_rawmidi_ioctl_compat NULL 1682 #endif 1683 1684 /* 1685 */ 1686 1687 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, 1688 struct snd_info_buffer *buffer) 1689 { 1690 struct snd_rawmidi *rmidi; 1691 struct snd_rawmidi_substream *substream; 1692 struct snd_rawmidi_runtime *runtime; 1693 unsigned long buffer_size, avail, xruns; 1694 unsigned int clock_type; 1695 static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" }; 1696 1697 rmidi = entry->private_data; 1698 snd_iprintf(buffer, "%s\n\n", rmidi->name); 1699 mutex_lock(&rmidi->open_mutex); 1700 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { 1701 list_for_each_entry(substream, 1702 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, 1703 list) { 1704 snd_iprintf(buffer, 1705 "Output %d\n" 1706 " Tx bytes : %lu\n", 1707 substream->number, 1708 (unsigned long) substream->bytes); 1709 if (substream->opened) { 1710 snd_iprintf(buffer, 1711 " Owner PID : %d\n", 1712 pid_vnr(substream->pid)); 1713 runtime = substream->runtime; 1714 spin_lock_irq(&substream->lock); 1715 buffer_size = runtime->buffer_size; 1716 avail = runtime->avail; 1717 spin_unlock_irq(&substream->lock); 1718 snd_iprintf(buffer, 1719 " Mode : %s\n" 1720 " Buffer size : %lu\n" 1721 " Avail : %lu\n", 1722 runtime->oss ? "OSS compatible" : "native", 1723 buffer_size, avail); 1724 } 1725 } 1726 } 1727 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { 1728 list_for_each_entry(substream, 1729 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, 1730 list) { 1731 snd_iprintf(buffer, 1732 "Input %d\n" 1733 " Rx bytes : %lu\n", 1734 substream->number, 1735 (unsigned long) substream->bytes); 1736 if (substream->opened) { 1737 snd_iprintf(buffer, 1738 " Owner PID : %d\n", 1739 pid_vnr(substream->pid)); 1740 runtime = substream->runtime; 1741 spin_lock_irq(&substream->lock); 1742 buffer_size = runtime->buffer_size; 1743 avail = runtime->avail; 1744 xruns = runtime->xruns; 1745 spin_unlock_irq(&substream->lock); 1746 snd_iprintf(buffer, 1747 " Buffer size : %lu\n" 1748 " Avail : %lu\n" 1749 " Overruns : %lu\n", 1750 buffer_size, avail, xruns); 1751 if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { 1752 clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT; 1753 if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names))) 1754 snd_iprintf(buffer, 1755 " Framing : tstamp\n" 1756 " Clock type : %s\n", 1757 clock_names[clock_type]); 1758 } 1759 } 1760 } 1761 } 1762 mutex_unlock(&rmidi->open_mutex); 1763 } 1764 1765 /* 1766 * Register functions 1767 */ 1768 1769 static const struct file_operations snd_rawmidi_f_ops = { 1770 .owner = THIS_MODULE, 1771 .read = snd_rawmidi_read, 1772 .write = snd_rawmidi_write, 1773 .open = snd_rawmidi_open, 1774 .release = snd_rawmidi_release, 1775 .llseek = no_llseek, 1776 .poll = snd_rawmidi_poll, 1777 .unlocked_ioctl = snd_rawmidi_ioctl, 1778 .compat_ioctl = snd_rawmidi_ioctl_compat, 1779 }; 1780 1781 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, 1782 struct snd_rawmidi_str *stream, 1783 int direction, 1784 int count) 1785 { 1786 struct snd_rawmidi_substream *substream; 1787 int idx; 1788 1789 for (idx = 0; idx < count; idx++) { 1790 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 1791 if (!substream) 1792 return -ENOMEM; 1793 substream->stream = direction; 1794 substream->number = idx; 1795 substream->rmidi = rmidi; 1796 substream->pstr = stream; 1797 spin_lock_init(&substream->lock); 1798 list_add_tail(&substream->list, &stream->substreams); 1799 stream->substream_count++; 1800 } 1801 return 0; 1802 } 1803 1804 static void release_rawmidi_device(struct device *dev) 1805 { 1806 kfree(container_of(dev, struct snd_rawmidi, dev)); 1807 } 1808 1809 /** 1810 * snd_rawmidi_new - create a rawmidi instance 1811 * @card: the card instance 1812 * @id: the id string 1813 * @device: the device index 1814 * @output_count: the number of output streams 1815 * @input_count: the number of input streams 1816 * @rrawmidi: the pointer to store the new rawmidi instance 1817 * 1818 * Creates a new rawmidi instance. 1819 * Use snd_rawmidi_set_ops() to set the operators to the new instance. 1820 * 1821 * Return: Zero if successful, or a negative error code on failure. 1822 */ 1823 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 1824 int output_count, int input_count, 1825 struct snd_rawmidi **rrawmidi) 1826 { 1827 struct snd_rawmidi *rmidi; 1828 int err; 1829 static const struct snd_device_ops ops = { 1830 .dev_free = snd_rawmidi_dev_free, 1831 .dev_register = snd_rawmidi_dev_register, 1832 .dev_disconnect = snd_rawmidi_dev_disconnect, 1833 }; 1834 1835 if (snd_BUG_ON(!card)) 1836 return -ENXIO; 1837 if (rrawmidi) 1838 *rrawmidi = NULL; 1839 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); 1840 if (!rmidi) 1841 return -ENOMEM; 1842 rmidi->card = card; 1843 rmidi->device = device; 1844 mutex_init(&rmidi->open_mutex); 1845 init_waitqueue_head(&rmidi->open_wait); 1846 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); 1847 INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); 1848 1849 if (id != NULL) 1850 strscpy(rmidi->id, id, sizeof(rmidi->id)); 1851 1852 snd_device_initialize(&rmidi->dev, card); 1853 rmidi->dev.release = release_rawmidi_device; 1854 dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device); 1855 1856 err = snd_rawmidi_alloc_substreams(rmidi, 1857 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], 1858 SNDRV_RAWMIDI_STREAM_INPUT, 1859 input_count); 1860 if (err < 0) 1861 goto error; 1862 err = snd_rawmidi_alloc_substreams(rmidi, 1863 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], 1864 SNDRV_RAWMIDI_STREAM_OUTPUT, 1865 output_count); 1866 if (err < 0) 1867 goto error; 1868 err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops); 1869 if (err < 0) 1870 goto error; 1871 1872 if (rrawmidi) 1873 *rrawmidi = rmidi; 1874 return 0; 1875 1876 error: 1877 snd_rawmidi_free(rmidi); 1878 return err; 1879 } 1880 EXPORT_SYMBOL(snd_rawmidi_new); 1881 1882 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) 1883 { 1884 struct snd_rawmidi_substream *substream; 1885 1886 while (!list_empty(&stream->substreams)) { 1887 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); 1888 list_del(&substream->list); 1889 kfree(substream); 1890 } 1891 } 1892 1893 static int snd_rawmidi_free(struct snd_rawmidi *rmidi) 1894 { 1895 if (!rmidi) 1896 return 0; 1897 1898 snd_info_free_entry(rmidi->proc_entry); 1899 rmidi->proc_entry = NULL; 1900 if (rmidi->ops && rmidi->ops->dev_unregister) 1901 rmidi->ops->dev_unregister(rmidi); 1902 1903 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); 1904 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); 1905 if (rmidi->private_free) 1906 rmidi->private_free(rmidi); 1907 put_device(&rmidi->dev); 1908 return 0; 1909 } 1910 1911 static int snd_rawmidi_dev_free(struct snd_device *device) 1912 { 1913 struct snd_rawmidi *rmidi = device->device_data; 1914 1915 return snd_rawmidi_free(rmidi); 1916 } 1917 1918 #if IS_ENABLED(CONFIG_SND_SEQUENCER) 1919 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) 1920 { 1921 struct snd_rawmidi *rmidi = device->private_data; 1922 1923 rmidi->seq_dev = NULL; 1924 } 1925 #endif 1926 1927 static int snd_rawmidi_dev_register(struct snd_device *device) 1928 { 1929 int err; 1930 struct snd_info_entry *entry; 1931 char name[16]; 1932 struct snd_rawmidi *rmidi = device->device_data; 1933 1934 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) 1935 return -ENOMEM; 1936 err = 0; 1937 mutex_lock(®ister_mutex); 1938 if (snd_rawmidi_search(rmidi->card, rmidi->device)) 1939 err = -EBUSY; 1940 else 1941 list_add_tail(&rmidi->list, &snd_rawmidi_devices); 1942 mutex_unlock(®ister_mutex); 1943 if (err < 0) 1944 return err; 1945 1946 err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, 1947 rmidi->card, rmidi->device, 1948 &snd_rawmidi_f_ops, rmidi, &rmidi->dev); 1949 if (err < 0) { 1950 rmidi_err(rmidi, "unable to register\n"); 1951 goto error; 1952 } 1953 if (rmidi->ops && rmidi->ops->dev_register) { 1954 err = rmidi->ops->dev_register(rmidi); 1955 if (err < 0) 1956 goto error_unregister; 1957 } 1958 #ifdef CONFIG_SND_OSSEMUL 1959 rmidi->ossreg = 0; 1960 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 1961 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1962 rmidi->card, 0, &snd_rawmidi_f_ops, 1963 rmidi) < 0) { 1964 rmidi_err(rmidi, 1965 "unable to register OSS rawmidi device %i:%i\n", 1966 rmidi->card->number, 0); 1967 } else { 1968 rmidi->ossreg++; 1969 #ifdef SNDRV_OSS_INFO_DEV_MIDI 1970 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); 1971 #endif 1972 } 1973 } 1974 if ((int)rmidi->device == amidi_map[rmidi->card->number]) { 1975 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, 1976 rmidi->card, 1, &snd_rawmidi_f_ops, 1977 rmidi) < 0) { 1978 rmidi_err(rmidi, 1979 "unable to register OSS rawmidi device %i:%i\n", 1980 rmidi->card->number, 1); 1981 } else { 1982 rmidi->ossreg++; 1983 } 1984 } 1985 #endif /* CONFIG_SND_OSSEMUL */ 1986 sprintf(name, "midi%d", rmidi->device); 1987 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); 1988 if (entry) { 1989 entry->private_data = rmidi; 1990 entry->c.text.read = snd_rawmidi_proc_info_read; 1991 if (snd_info_register(entry) < 0) { 1992 snd_info_free_entry(entry); 1993 entry = NULL; 1994 } 1995 } 1996 rmidi->proc_entry = entry; 1997 #if IS_ENABLED(CONFIG_SND_SEQUENCER) 1998 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ 1999 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { 2000 rmidi->seq_dev->private_data = rmidi; 2001 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; 2002 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); 2003 snd_device_register(rmidi->card, rmidi->seq_dev); 2004 } 2005 } 2006 #endif 2007 return 0; 2008 2009 error_unregister: 2010 snd_unregister_device(&rmidi->dev); 2011 error: 2012 mutex_lock(®ister_mutex); 2013 list_del(&rmidi->list); 2014 mutex_unlock(®ister_mutex); 2015 return err; 2016 } 2017 2018 static int snd_rawmidi_dev_disconnect(struct snd_device *device) 2019 { 2020 struct snd_rawmidi *rmidi = device->device_data; 2021 int dir; 2022 2023 mutex_lock(®ister_mutex); 2024 mutex_lock(&rmidi->open_mutex); 2025 wake_up(&rmidi->open_wait); 2026 list_del_init(&rmidi->list); 2027 for (dir = 0; dir < 2; dir++) { 2028 struct snd_rawmidi_substream *s; 2029 2030 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { 2031 if (s->runtime) 2032 wake_up(&s->runtime->sleep); 2033 } 2034 } 2035 2036 #ifdef CONFIG_SND_OSSEMUL 2037 if (rmidi->ossreg) { 2038 if ((int)rmidi->device == midi_map[rmidi->card->number]) { 2039 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); 2040 #ifdef SNDRV_OSS_INFO_DEV_MIDI 2041 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); 2042 #endif 2043 } 2044 if ((int)rmidi->device == amidi_map[rmidi->card->number]) 2045 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); 2046 rmidi->ossreg = 0; 2047 } 2048 #endif /* CONFIG_SND_OSSEMUL */ 2049 snd_unregister_device(&rmidi->dev); 2050 mutex_unlock(&rmidi->open_mutex); 2051 mutex_unlock(®ister_mutex); 2052 return 0; 2053 } 2054 2055 /** 2056 * snd_rawmidi_set_ops - set the rawmidi operators 2057 * @rmidi: the rawmidi instance 2058 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX 2059 * @ops: the operator table 2060 * 2061 * Sets the rawmidi operators for the given stream direction. 2062 */ 2063 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 2064 const struct snd_rawmidi_ops *ops) 2065 { 2066 struct snd_rawmidi_substream *substream; 2067 2068 list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) 2069 substream->ops = ops; 2070 } 2071 EXPORT_SYMBOL(snd_rawmidi_set_ops); 2072 2073 /* 2074 * ENTRY functions 2075 */ 2076 2077 static int __init alsa_rawmidi_init(void) 2078 { 2079 2080 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); 2081 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); 2082 #ifdef CONFIG_SND_OSSEMUL 2083 { int i; 2084 /* check device map table */ 2085 for (i = 0; i < SNDRV_CARDS; i++) { 2086 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 2087 pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", 2088 i, midi_map[i]); 2089 midi_map[i] = 0; 2090 } 2091 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { 2092 pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", 2093 i, amidi_map[i]); 2094 amidi_map[i] = 1; 2095 } 2096 } 2097 } 2098 #endif /* CONFIG_SND_OSSEMUL */ 2099 return 0; 2100 } 2101 2102 static void __exit alsa_rawmidi_exit(void) 2103 { 2104 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); 2105 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); 2106 } 2107 2108 module_init(alsa_rawmidi_init) 2109 module_exit(alsa_rawmidi_exit) 2110